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diff --git a/layout/reftests/flexbox/flexbox-position-absolute-3.xhtml b/layout/reftests/flexbox/flexbox-position-absolute-3.xhtml
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+++ b/layout/reftests/flexbox/flexbox-position-absolute-3.xhtml
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+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!--
+     Testcase with absolutely positioned flex container.
+     This positioning is with respect to the containing block's left edge.
+-->
+<html xmlns="http://www.w3.org/1999/xhtml">
+  <head>
+    <style>
+      div.containingBlock {
+        top: 15px;
+        left: 20px;
+        height: 400px;
+        position: absolute;
+        border: 2px dashed purple;
+      }
+      div.flexbox {
+        top: 30px;
+        left: 40px;
+        width: 200px;
+        height: 100px;
+        display: flex;
+        position: absolute;
+        border: 1px solid black;
+      }
+      div.a {
+        flex: 1 0 30px;
+        height: 100px;
+        background: lightgreen;
+      }
+      div.b {
+        flex: 2 0 20px;
+        height: 100px;
+        background: yellow;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="containingBlock">
+      <div class="flexbox"><div class="a"/><div class="b"/></div>
+    </div>
+  </body>
+</html>